Remove unused securityState code in WebInspector.SecurityModel.

Source/devtools/front_end/security/SecurityModel.js

Index: Source/devtools/front_end/security/SecurityModel.js
diff --git a/Source/devtools/front_end/security/SecurityModel.js b/Source/devtools/front_end/security/SecurityModel.js
index d0058571ee2c60a7bbfa0066d805e7ef4088d897..b90015a3879bc0c030f8250b84c0d5adb2d7efd6 100644
--- a/Source/devtools/front_end/security/SecurityModel.js
+++ b/Source/devtools/front_end/security/SecurityModel.js
@@ -14,8 +14,6 @@ WebInspector.SecurityModel = function(target)
     this._securityAgent = target.securityAgent();
     target.registerSecurityDispatcher(this._dispatcher);
     this._securityAgent.enable();
-
-    this._securityState = SecurityAgent.SecurityState.Unknown;
 }
 
 WebInspector.SecurityModel.EventTypes = {
@@ -23,14 +21,6 @@ WebInspector.SecurityModel.EventTypes = {
 }
 
 WebInspector.SecurityModel.prototype = {
-    /**
-     * @return {!SecurityAgent.SecurityState} securityState
-     */
-    securityState: function()
-    {
-        return /** @type {!SecurityAgent.SecurityState} */ (this._securityState);
-    },
-
     __proto__: WebInspector.SDKModel.prototype
 }